<?php 
class product_plugin_products extends abstract_product_plugin {

    public function getProducts($data){	
        $sql = "SELECT *, 
            (SELECT AVG(rating) AS total FROM " . $this->db_prefix . "review r1 
            WHERE r1.product_id = p.product_id AND r1.status = '1' 
            GROUP BY r1.product_id) AS rating,

            (SELECT price FROM " . $this->db_prefix . "product_discount pd2 
            WHERE pd2.product_id = p.product_id 
            AND pd2.user_group_id = :user_group_id  
            AND pd2.quantity = '1' 
            AND ((pd2.date_start = '0000-00-00' OR pd2.date_start < NOW()) 
            AND (pd2.date_end = '0000-00-00' OR pd2.date_end > NOW())) 
            ORDER BY pd2.priority ASC, pd2.price ASC LIMIT 1) AS discount, 

            (SELECT price FROM " . $this->db_prefix . "product_special ps 
            WHERE ps.product_id = p.product_id 
            AND ps.user_group_id = :user_group_id 
            AND ((ps.date_start = '0000-00-00' OR ps.date_start < NOW()) 
            AND (ps.date_end = '0000-00-00' OR ps.date_end > NOW())) 
            ORDER BY ps.priority ASC, ps.price ASC LIMIT 1) AS special,

            (SELECT COUNT(*) AS total FROM " . $this->db_prefix . "review r2 
            WHERE r2.product_id = p.product_id 
            AND r2.status = '1' 
            GROUP BY r2.product_id) 
            AS reviews";

        if (!empty($data['filter_category_id'])) {
            if (!empty($data['filter_sub_category'])) {
                $sql .= " FROM " . $this->db_prefix . "category_path cp 
                    LEFT JOIN " . $this->db_prefix . "product_to_category p2c 
                    ON (cp.category_id = p2c.category_id)";
            } else {
                $sql .= " FROM " . $this->db_prefix . "product_to_category p2c";
            }

            if (!empty($data['filter_filter'])) {
                $sql .= " LEFT JOIN " . $this->db_prefix . "product_filter pf 
                    ON (p2c.product_id = pf.product_id) 
                    LEFT JOIN " . $this->db_prefix . "product p 
                    ON (pf.product_id = p.product_id)";
            } else {
                $sql .= " LEFT JOIN " . $this->db_prefix . "product p 
                    ON (p2c.product_id = p.product_id)";
            }
        } else {
            $sql .= " FROM " . $this->db_prefix . "product p";
        }

        $sql .= " LEFT JOIN " . $this->db_prefix . "product_description pd 
            ON (p.product_id = pd.product_id) 
            LEFT JOIN " . $this->db_prefix . "product_to_store p2s 
            ON (p.product_id = p2s.product_id) 
            WHERE pd.language_id = :language_id 
            AND p.status = '1' 
            AND p.date_available <= NOW() 
            AND p2s.store_id = :store_id";

        $params = array(
            ':user_group_id'    => (int) $this->user_group_id,
            ':language_id'          => (int) $this->language_id,
            ':store_id'             => (int) $this->site_id
        );

        if (!empty($data['filter_category_id'])) {
            if (!empty($data['filter_sub_category'])) {
                $sql .= " AND cp.path_id = :filter_category_id";
            } else {
                $sql .= " AND p2c.category_id = :filter_category_id";
            }

            $params[':filter_category_id'] = $data['filter_category_id'];

            if (!empty($data['filter_filter'])) {
                $implode = array();

                $filters = explode(',', $data['filter_filter']);

                foreach ($filters as $filter_id) {
                    $implode[] = (int)$filter_id;
                }

                $sql .= " AND pf.filter_id IN (:filter_id)";

                $params[':filter_id'] =  implode(',', $implode);
            }
        }

        if (!empty($data['filter_name']) || !empty($data['filter_tag'])) {
            $sql .= " AND (";

            if (!empty($data['filter_name'])) {
                $implode = array();

                $words = explode(' ', trim(preg_replace('/\s\s+/', ' ', $data['filter_name'])));
                $count = 0;
                foreach ($words as $word) {
                    $id = ':word_' . $count;
                    $implode[] = "pd.name LIKE " . $id;
                    $params[$id] = "%" . $word . "%";
                }

                if ($implode) {
                    $sql .= " " . implode(" AND ", $implode) . "";
                }

                if (!empty($data['filter_description'])) {
                    $sql .= " OR pd.description LIKE :filter_name";
                    $params[':filter_name'] = "%" . $data['filter_name'] . "%";
                }
            }

            if (!empty($data['filter_name']) && !empty($data['filter_tag'])) {
                $sql .= " OR ";
            }

            if (!empty($data['filter_tag'])) {
                $sql .= "pd.tag LIKE :filter_tag";
                $params[':filter_tag'] = "%" . $data['filter_tag'] . "%";
            }

            $sql .= " OR LCASE(p.model) = :lower_filter_name";	
            $sql .= " OR LCASE(p.sku) = :lower_filter_name";
            $sql .= " OR LCASE(p.upc) = :lower_filter_name";
            $sql .= " OR LCASE(p.ean) = :lower_filter_name";
            $sql .= " OR LCASE(p.jan) = :lower_filter_name";
            $sql .= " OR LCASE(p.isbn) = :lower_filter_name";
            $sql .= " OR LCASE(p.mpn) = :lower_filter_name";

            $sql .= ")";

            $params[':lower_filter_name'] = utf8_strtolower($data['filter_name']);
        }

        if (!empty($data['filter_manufacturer_id'])) {
            $sql .= " AND p.manufacturer_id = :manufacturer_id";
            $params[':manufacturer_id'] = $data['filter_manufacturer_id'];
        }

        $sql .= " GROUP BY p.product_id";

        $sort_data = array(
            'pd.name',
            'p.model',
            'p.quantity',
            'p.price',
            'rating',
            'p.sort_order',
            'p.date_added'
        );	

        if (isset($data['sort']) && in_array($data['sort'], $sort_data)) {
            if ($data['sort'] == 'pd.name' || $data['sort'] == 'p.model') {
                $sql .= " ORDER BY LCASE(:sort)";
                $params[':sort'] = $data['sort'];
            } elseif ($data['sort'] == 'p.price') {
                $sql .= " ORDER BY (CASE WHEN special IS NOT NULL THEN special 
                    WHEN discount IS NOT NULL THEN discount
                    ELSE p.price END)";
            } else {
                $sql .= " ORDER BY :sort";
                $params[':sort'] = $data['sort'];
            }
        } else {
            $sql .= " ORDER BY p.sort_order";	
        }
        if (isset($data['order']) && ($data['order'] == 'DESC')) {
            $sql .= " DESC, LCASE(pd.name) DESC";
        } else {
            $sql .= " ASC, LCASE(pd.name) ASC";
        }

        if(isset($data['start']) || isset($data['limit'])){	
            if ($data['start'] < 0) {
                $data['start'] = 0;
            }				

            if ($data['limit'] < 1) {
                $data['limit'] = 20;
            }	

            $start = (int)trim($data['start']);
            $limit = (int)trim($data['limit']);

            $sql .= " LIMIT :start, :limit";

            $query = $this->pdo->prepare($sql);

            $query->bindParam(':start', $start, PDO::PARAM_INT);
            $query->bindParam(':limit', $limit, PDO::PARAM_INT);

            foreach($params as $name => &$value){
                $query->bindParam($name, $value, PDO::PARAM_STR);
            }
            $query->execute();
        } else {
            $query = $this->pdo->prepare($sql);
            $query->execute($params);
        }

        $product_data = array();

        while ($product = $query->fetchObject('class_product')) {
            $product_data[$product->get_id()] = $product;	
        }

        return $product_data;
    }
}
